Bishop Albert of Saxony (philosopher) (c. 1320–1390) – German bishop who wrote on logic and physics; with Buridan he helped develop the theory that was a precursor to the modern theory of inertia

St. Albertus Magnus (c. 1206–1280) – Dominican friar and Bishop of Regensberg who has been described as "one of the most famous precursors of modern science in the High Middle Ages." Patron Saint of Natural Sciences; Works in physics, logic, metaphysics, biology and psychology.

Fr. Giulio Alenio (1582–1649) – Jesuit theologian, astronomer and mathematician; was sent to the Far East as a missionary and adopted a Chinese name and customs; wrote 25 books, including a cosmography and a Life of Jesus in Chinese.

Fr. Jacques de Billy (1602–1679) – Jesuit who has produced a number of results in number theory which have been named after him; published several astronomical tables; the lunar crater Billy is named after him

Fr. Paolo Boccone (1633–1704) – Cistercian botanist who contributed to the fields of medicine and toxicology

Fr. Ismaël Bullialdus (1605–1694) – priest, astronomer and member of the Royal Society; the Bullialdus crater is named in his honor

Fr. Jean Buridan (c. 1300 – after 1358) – priest who formulated early ideas of momentum and inertial motion and sowed the seeds of the Copernican revolution in Europe

Fr. Roberto Busa (1913–2011) – Jesuit, wrote a lemmatization of the complete works of St. Thomas Aquinas (Index Thomisticus) which was later digitalized by IBM. Fr. Busa is the impetus for the use of alphabet, including search engines on computers and, later, the Net

Fr. Niccolò Cabeo (1586–1650) – Jesuit mathematician; the crater Cabeus is named in his honor

Fr. Nicholas Callan (1799–1846) – priest and Irish scientist best known for his work on the induction coil

Fr. John Cantius (1390–1473) – priest and Buridanist mathematical physicist who further developed the theory of impetus

Fr. Jean Baptiste Carnoy (1836–1899) – priest, has been called the Founder of the Science of Cytology

Fr. Paolo Casati (1617–1707) – Jesuit mathematician who wrote on astronomy and vacuums; the lunar crater Casatus is named after him

Fr. Laurent Cassegrain (1629–1693) – priest who was the probable namesake of the Cassegrain telescope; the lunar crater Cassegrain is named after him

Fr. Benedetto Castelli (1578–1643) – Benedictine mathematician; long-time friend and supporter of Galileo Galilei, who was his teacher; wrote an important work on fluids in motion

Fr. Bonaventura Cavalieri (1598–1647) – Jesuate priest (not to be confused with Jesuit) known for his work on the problems of optics and motion, work on the precursors of infinitesimal calculus and the introduction of logarithms to Italy; his principle in geometry partially anticipated integral calculus; the lunar crater Cavalerius is named in his honor

Fr. James Curley (astronomer) (1796–1889) – Jesuit, first director of Georgetown Observatory and determined the latitude and longitude of Washington, D.C.

Fr. Albert Curtz (1600–1671) – Jesuit astronomer who expanded on the works of Tycho Brahe and contributed to early understanding of the moon; the lunar crater Curtius is named after him

Fr. Johann Baptist Cysat (1587–1657) – Jesuit mathematician and astronomer, after whom the lunar crater Cysatus is named; published the first printed European book concerning Japan; one of the first to make use of the newly developed telescope; most important work was on comets

Fr. Václav Prokop Diviš (1698–1765) – Czech priest who studied electrical phenomena and constructed, among other inventions, the first electrified musical instrument in history

Fr. Alberto Dou (1915–2009) – Spanish Jesuit priest who was president of the Royal Society of Mathematics, member of the Royal Academy of Natural, Physical and Exact Sciences and one of the foremost mathematicians of his country

Fr. Johann Dzierzon (1811–1906) – priest and pioneering apiarist who discovered the phenomenon of parthenogenesis among bees and designed the first successful movable-frame beehive; has been described as the "Father of modern apiculture"

Fr. Jean-Charles de la Faille (1597–1652) – Jesuit mathematician who determined the center of gravity of the sector of a circle for the first time

Fr. Gabriele Falloppio (1523–1562) – priest and one of the most important anatomists and physicians of the sixteenth century; the Fallopian tubes, which extend from the uterus to the ovaries, are named for him

Fr. Gyula Fényi (1845–1927) – Jesuit astronomer and director of the Haynald Observatory; noted for his observations of the sun; the lunar crater Fényi is named after him

Fr. Pierre Gassendi (1592–1655) – French priest, astronomer and mathematician who published the first data on the transit of Mercury; best known intellectual project attempted to reconcile Epicurean atomism with Christianity

Fr. Agostino Gemelli (1878–1959) – Franciscan physician and psychologist; founded Catholic University of the Sacred Heart in Milan

Fr. Francesco Maria Grimaldi (1618–1663) – Jesuit who discovered the diffraction of light (indeed coined the term "diffraction"), investigated the free fall of objects and built and used instruments to measure lunar geological features

Fr. Robert Grosseteste (c. 1175 – 1253) – bishop who was one of the most knowledgeable men of the Middle Ages; has been called "the first man ever to write down a complete set of steps for performing a scientific experiment"

Fr. Paul Guldin (1577–1643) – Jesuit mathematician and astronomer who discovered the Guldinus theorem to determine the surface and the volume of a solid of revolution

Fr. Bartolomeu de Gusmão (1685–1724) – Jesuit known for his early work on lighter-than-air airship design

Fr. Johann Georg Hagen (1847–1930) – Jesuit director of the Georgetown and Vatican Observatories; the lunar crater Hagen is named after him

Fr. Giovanni Inghirami (1779–1851) – Italian Piarist astronomer who has a lunar valley named after him as well as a crater

Fr. François Jacquier (1711–1788) – Franciscan mathematician and physicist; at his death he was connected with nearly all the great scientific and literary societies of Europe

Fr. Stanley Jaki (1924–2009) – Benedictine priest and prolific writer who wrote on the relationship between science and theology

Fr. Ányos Jedlik (1800–1895) – Benedictine engineer, physicist and inventor; considered by Hungarians and Slovaks to be the unsung Father of the dynamo and electric motor

Fr. Georg Joseph Kamel (1661–1706) – Jesuit missionary and botanist who established the first pharmacy in the Philippines

Fr. Karl Kehrle (1898–1996) – Benedictine Monk of Buckfast Abbey, England; beekeeper; world authority on bee breeding, developer of the Buckfast bee which is the hybrid commonly used currently

Fr. Eusebio Kino (1645–1711) – Jesuit missionary, mathematician, astronomer and cartographer; drew maps based on his explorations first showing that California was not an island, as then believed; published an astronomical treatise in Mexico City of his observations of the Kirsch comet

Fr. Otto Kippes (1905–1994) – priest acknowledged for his work in asteroid orbit calculations; the main belt asteroid 1780 Kippes was named in his honor

Fr. Athanasius Kircher (1602–1680) – Jesuit who has been called the Father of Egyptology and "Master of a hundred arts"; wrote an encyclopedia of China; one of the first people to observe microbes through a microscope

Fr. Emmanuel Maignan (1601–1676) – Minim physicist and professor of medicine who published works on gnomonics and perspective

Fr. Charles Malapert (1581–1630) – Jesuit writer, astronomer and proponent of Aristotelian cosmology; also known for observations of sunpots and of the lunar surface and the lunar crater Malapert is named after him

Fr. Nicolas Malebranche (1638–1715) – Oratorian philosopher who studied physics, optics and the laws of motion and disseminated the ideas of Descartes and Leibniz

Fr. Marie-Victorin (1885–1944) – Christian Brother and botanist best known as the Father of the Jardin Botanique de Montréal

Fr. Edme Mariotte (c. 1620–1684) – priest and physicist who recognized Boyle's Law and wrote about the nature of color

Fr. Francesco Maurolico (1494–1575) – Benedictine who made contributions to the fields of geometry, optics, conics, mechanics, music and astronomy and gave the first known proof by mathematical induction

Cardinal Nicholas of Cusa (1401–1464) – Cardinal, philosopher, jurist, mathematician, astronomer and one of the great geniuses and polymaths of the 15th century

Fr. Julius Nieuwland (1878–1936) – Holy Cross priest, known for his contributions to acetylene research and its use as the basis for one type of synthetic rubber, which eventually led to the invention of neoprene by DuPont

Fr. Hugo Obermaier (1877–1946) – priest, prehistorian and anthropologist who is known for his work on the diffusion of mankind in Europe during the Ice Age, as well as his work with north Spanish cave art

Fr. William of Ockham (c. 1288 – c. 1348) – Franciscan Scholastic who wrote significant works on logic, physics and theology; known for Occam's razor-principle

Bishop Nicole Oresme (c. 1323–1382) – one of the most famous and influential philosophers of the later Middle Ages; economist, mathematician, physicist, astronomer, philosopher, theologian and Bishop of Lisieux and competent translator; one of the most original thinkers of the 14th century

Fr. Barnaba Oriani (1752–1832) – Barnabite geodesist, astronomer and scientist whose greatest achievement was his detailed research of the planet Uranus; also known for Oriani's Theorem

Fr. Stephen Joseph Perry (1833–1889) – Jesuit astronomer and Fellow of the Royal Society; made frequent observations of Jupiter's satellites, of stellar occultations, of comets, of meteorites, of sun spots and faculae

Fr. Giuseppe Piazzi (1746–1826) – Theatine mathematician and astronomer who discovered Ceres, today known as the largest member of the asteroid belt; also did important work cataloguing stars

Fr. Jean Picard (1620–1682) – priest and first person to measure the size of the Earth to a reasonable degree of accuracy; also developed what became the standard method for measuring the right ascension of a celestial object; the PICARD mission, an orbiting solar observatory, is named in his honor

Fr. Alexandre Guy Pingré (1711–1796) – French priest astronomer and naval geographer; the lunar crater Pingré is named after him, as is the asteroid 12719 Pingré

Fr. Andrew Pinsent (1966–) – priest whose current research includes the application of insights from autism and social cognition to 'second-person' accounts of moral perception and character formation; his previous scientific research contributed to the DELPHI experiment at CERN

Fr. Charles Plumier (1646–1704) – Minim friar who is considered one of the most important botanical explorers of his time

Fr. Marcin Odlanicki Poczobutt (1728–1810) – Jesuit astronomer and mathematician; granted the title of the King's Astronomer; the lunar crater Poczobutt is named after him

Fr. Léon Abel Provancher (1820–1892) – priest and naturalist devoted to the study and description of the fauna and flora of Canada; his pioneer work won for him the appellation of the "Father of Canadian Natural History"

Fr. Louis Receveur (1757–1788) – Franciscan naturalist and astronomer; described as being as close as one could get to being an ecologist in the 18th century

Fr. Franz Reinzer (1661–1708) – Jesuit who wrote an in-depth meteorological, astrological and political compendium covering topics such as comets, meteors, lightning, winds, fossils, metals, bodies of water and subterranean treasures and secrets of the earth

Bishop Louis Rendu (1789–1859) – bishop who wrote an important book on the mechanisms of glacial motion; the Rendu Glacier, Alaska, US and Mount Rendu, Antarctica are named for him

Fr. Matteo Ricci (1552–1610) – one of the founding fathers of the Jesuit China Mission and co-author of the first European-Chinese dictionary. (On route to being a saint)

Fr. Giovanni Battista Riccioli (1598–1671) – Jesuit astronomer who authored Almagestum novum, an influential encyclopedia of astronomy; the first person to measure the rate of acceleration of a freely falling body; created a selenograph with Father Grimaldi that now adorns the entrance at the National Air and Space Museum in Washington, D.C.

Abbot Richard of Wallingford (1292–1336) – abbot, renowned clockmaker and one of the initiators of western trigonometry

Fr. Johannes Ruysch (c. 1460–1533) – priest, explorer, cartographer and astronomer who created the second oldest known printed representation of the New World

Fr. Johannes de Sacrobosco (c. 1195 – c. 1256) – Irish monk and astronomer who wrote the authoritative medieval astronomy text Tractatus de Sphaera; his Algorismus was the first text to introduce Hindu-Arabic numerals and procedures into the European university curriculum; the lunar crater Sacrobosco is named after him

Fr. Gregoire de Saint-Vincent (1584–1667) – Jesuit mathematician who made important contributions to the study of the hyperbola

Fr. Domingo de Soto (1494–1560) – Spanish Dominican priest and professor at the University of Salamanca; in his commentaries to Aristotle he proposed that free falling bodies undergo constant acceleration

Fr. Lazzaro Spallanzani (1729–1799) – priest, biologist and physiologist who made important contributions to the experimental study of bodily functions, animal reproduction and essentially discovered echolocation; his research of biogenesis paved the way for the investigations of Louis Pasteur

Fr. Valentin Stansel (1621–1705) – Jesuit astronomer who made important observations of comets

Fr. Johan Stein (1871–1951) – Jesuit astronomer and director of the Vatican Observatory, which he modernized and relocated to Castel Gandolfo; the crater Stein on the far side of the Moon is named after him

Bl. Nicolas Steno (1638–1686) – Bishop beatified by Pope John Paul II who is often called the Father of geology and stratigraphy, and is known for Steno's principles

Pope Sylvester II (c. 946–1003) – Prolific scholar who endorsed and promoted Arabic knowledge of arithmetic, mathematics and astronomy in Europe, reintroducing the abacus and armillary sphere which had been lost to Europe since the end of the Greco-Roman era

Fr. Alexius Sylvius Polonus (1593 – c. 1653) – Jesuit astronomer who studied sunspots and published a work on calendariography

Fr. Ignacije Szentmartony (1718–1793) – Jesuit cartographer, mathematician and astronomer who became a member of the expedition that worked on the rearrangement of the frontiers among colonies in South America

Fr. Franz de Paula Triesnecker (1745–1817) – Jesuit astronomer and director of the Vienna Observatory; published a number of treatises on astronomy and geography; the lunar crater Triesnecker is named after him

Fr. Luca Valerio (1552–1618) – Jesuit mathematician who developed ways to find volumes and centers of gravity of solid bodies

Fr. Pierre Varignon (1654–1722) – priest and mathematician whose principle contributions were to statics and mechanics; created a mechanical explanation of gravitation

Fr. Jacques de Vaucanson (1709–1782) – French Minim friar inventor and artist who was responsible for the creation of impressive and innovative automata and machines such as the first completely automated loom

Fr. Ferdinand Verbiest (1623–1688) – Jesuit astronomer and mathematician; designed what some claim to be the first ever self-propelled vehicle, which many claim this as the world's first automobile

Fr. Francesco de Vico (1805–1848) – Jesuit astronomer who discovered or co-discovered a number of comets; also made observations of Saturn and the gaps in its rings; the lunar crater De Vico and the asteroid 20103 de Vico are named after him

Fr. Vincent of Beauvais (c.1190–c.1264) – Dominican who wrote the most influential encyclopedia of the Middle Ages

Fr. Benito Viñes (1837–1893) – Jesuit meteorologist who made the first weather model to predict the trajectory of a hurricane

Fr. John Zahm (1851–1921) – Holy Cross priest and South American explorer

Fr. Giuseppe Zamboni (1776–1846) – priest and physicist who invented the Zamboni pile, an early electric battery similar to the Voltaic pile

Fr. Francesco Zantedeschi (1797–1873) – priest who was among the first to recognize the marked absorption by the atmosphere of red, yellow and green light; published papers on the production of electric currents in closed circuits by the approach and withdrawal of a magnet, thereby anticipating Michael Faraday's classical experiments of 1831

Fr. Niccolò Zucchi (1586–1670) – claimed to have tried to build a reflecting telescope in 1616 but abandoned the idea (maybe due to the poor quality of the mirror); may have been the first to see the belts on the planet Jupiter (1630)

Fr. Giovanni Battista Zupi (c. 1590–1650) – Jesuit astronomer, mathematician and first person to discover that the planet Mercury had orbital phases; the lunar crater Zupus is named after him

The list of great Catholic scientists is as long as the years since modern science became conscious of itself, but my clerical perspective would focus on Catholic priests compelled by beauty to discover more about the ordering of things for, as Alexander Pope wrote, “Order is heaven’s first law.” Everyone knows of Roger Bacon and Albert the Great. But Copernicus was a priest, too, and likewise the geneticist Mendel. Barsanti developed the internal combustion engine after Buridan theorized inertial motion. Clavius was a guide in designing the Gregorian calendar, Gassendi observed the transit of a planet across the sun. Picard was the first to calculate accurately the size of the earth, Steno founded modern geology as Mabillion did paleography and Valentin modern chemistry and Marenne acoustics. The first wireless transmission of the human voice was by Sarasa. Kirche was the first to observe microbes by microscope and Jedlike invented the dynamo and electric motor. Thirty-five craters on our moon are named for priests who contributed to natural science.

Fairytales don’t tell children that dragons exist; children already know that dragons exist. Fairytales tell children that dragons can be killed. - G.K. Chesterton

Find the courage to proclaim Christ, … and the unchanging truths which have their foundation in Him. These are the truths that set us free! They are the truths which alone can guarantee respect for the inalienable dignity and rights of each man, woman and child in our world – including the most defenseless of all human beings, the unborn child in the mother’s womb. - Pope Benedict XVI

God does not choose the qualified. He qualifies the chosen - Madre Teresa de Calcutá

God gave us ten commandments, not ten thousand. Why? Why not a more complete list of specifics? Because he wanted freedom and variety. Why do you think he created so many persons? Why not just one? Because he loves different personalities. He wants his chorus to sing in harmony, but not in unison - Peter Kreeft

How monotonously alike all the great tyrants and conquerors have been; how gloriously different are the saints. - C.S Lewis

I would like to remind everyone, especially everyone engaged in boosting the world’s economic and social assets, that the primary capital to be safeguarded and valued is man, the human person in his or her integrity - Papa Bento XVI

If medieval people talked less about their own dignity, it is because they were more concerned about God´s dignity; if modern people talk more about it, it is because they are more concerned with themselves - Edward Feser

If you find a perfect parish, you go ahead and join her, it won't be perfect anymore - Matthew Kelly

In fact, a fine distinction could be a flat contradiction - G.K.Chesterton

It is true that I am of an older fashion; much that I love has been destroyed or sent into exile. G. K. Chesterton

Liberty cannot be established without morality, nor morality without faith - Alexis de Tocqueville

Mittite in Dexteram Navigii Rete, et Invenietis (João 21,6)

Multiculturalism is the doctrine which says that no culture can ever claim precedence over any other. So there can be no hierarchy of values, and no society can uphold its historic traditions and values against any challenge - Melaine Phillips

Napoleon himself announced to the Pope Pius VII that he was going to destroy the Church, to which Pius VII responded, “Oh my little man, you think you’re going to succeed in accomplishing what centuries of priests and bishops have tried and failed to do!”

Nowadays the devil has made such a mess of everything in the system of life on earth that the world will presently become uninhabitable for anybody but Saints. - Jacques Maritain

Of all tyrannies, a tyranny exercised for the good of its victims may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron’s cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end, for they do so with the approval of their own conscience - Clive.S. Lewis

One was the view that stars are personal beings, governing our lives (astrology); the other the general theory that men have one mind between them (marxism); a view obviously opposed to immortality; that is, to individuality - G.K Chesteron

The difficulty of explaining “why I am Catholic” is that there are 10,000 reasons all amounting to one reason: that Catholicism is true. - GK Chesterton

The divide in Western civilization isn't between rich and poor, red vs. blue, or the uneducated vs. the educated. It's God. God is the dividing line. You either believe God loves each of us and grants us inalienable rights or you believe that everything is negotiable including life - Matthew Archbold

The obedient are not held captive by Holy Mother Church; it is the disobedient who are held captive by the world! - Diane M. Korzeniewski

The true soldier fights not because he hates what is in front of him, but because he loves what is behind him - Chesterton

The two most destructive heresies — and the two most popular — are angelism, confusing man with an angel by denying his likeness to animals, and animalism, confusing man with an animal by denying his likeness to angels - Peter Kreeft

The whole of history is a struggle between two loves: love of oneself to contempt of God; love of God to contempt of self, in martyrdom. We are in this struggle.

There are only three kinds of people: those who seek God and have found Him — these are wise and happy; those who seek God and have not yet found Him — these are wise and unhappy; and those who live without either seeking God or finding Him — and these are both unwise and unhappy. - Blaise Pascal

There are two sorts of people who might be tempted to think of death as a friend: those who think the nature of the human person has nothing to do with the body, and those who think it has everything to do with the body; in short, Platonists and materialists - Edward Feser

To avoid therefore the evils of inconstancy and versatility, ten thousand times worse than those of obstinacy and the blindest prejudice, we have consecrated the state - Edmund Burke on French Revolution

To be or not to be – that is the question”, then the massive medieval doctor (St. Thomas) does most certainly reply in voice of thunder, “To be – that is the answer - Chesterton